svn commit: r256091 - in projects/random_number_generator: contrib/llvm/lib/Target/X86 share/man/man9

[Mark Murray]

Author: markm
Date: Sun Oct  6 18:56:13 2013
New Revision: 256091
URL: http://svnweb.freebsd.org/changeset/base/256091

Log:
  MFC - tracking commit.

Modified:
  projects/random_number_generator/contrib/llvm/lib/Target/X86/X86InstrInfo.cpp
  projects/random_number_generator/share/man/man9/lock.9
Directory Properties:
  projects/random_number_generator/   (props changed)
  projects/random_number_generator/contrib/llvm/   (props changed)

Modified: projects/random_number_generator/contrib/llvm/lib/Target/X86/X86InstrInfo.cpp
==============================================================================
--- projects/random_number_generator/contrib/llvm/lib/Target/X86/X86InstrInfo.cpp	Sun Oct  6 16:12:45 2013	(r256090)
+++ projects/random_number_generator/contrib/llvm/lib/Target/X86/X86InstrInfo.cpp	Sun Oct  6 18:56:13 2013	(r256091)
@@ -3881,6 +3881,10 @@ MachineInstr* X86InstrInfo::foldMemoryOp
   const MachineFrameInfo *MFI = MF.getFrameInfo();
   unsigned Size = MFI->getObjectSize(FrameIndex);
   unsigned Alignment = MFI->getObjectAlignment(FrameIndex);
+  // If the function stack isn't realigned we don't want to fold instructions
+  // that need increased alignment.
+  if (!RI.needsStackRealignment(MF))
+    Alignment = std::min(Alignment, TM.getFrameLowering()->getStackAlignment());
   if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
     unsigned NewOpc = 0;
     unsigned RCSize = 0;

Modified: projects/random_number_generator/share/man/man9/lock.9
==============================================================================
--- projects/random_number_generator/share/man/man9/lock.9	Sun Oct  6 16:12:45 2013	(r256090)
+++ projects/random_number_generator/share/man/man9/lock.9	Sun Oct  6 18:56:13 2013	(r256091)
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 16, 2011
+.Dd October 6, 2013
 .Dt LOCK 9
 .Os
 .Sh NAME
@@ -164,11 +164,17 @@ If an exclusive lock has been recursed, 
 .Xr panic 9 .
 .It Dv LK_UPGRADE
 Upgrade a shared lock to an exclusive lock.
-If this call fails, the shared lock is lost.
+If this call fails, the shared lock is lost, even if the
+.Dv LK_NOWAIT
+flag is specified.
 During the upgrade, the shared lock could
 be temporarily dropped.
 Attempts to upgrade an exclusive lock will cause a
 .Xr panic 9 .
+.It Dv LK_TRYUPGRADE
+Try to upgrade a shared lock to an exclusive lock.
+The failure to upgrade does not result in the dropping
+of the shared lock ownership.
 .It Dv LK_RELEASE
 Release the lock.
 Releasing a lock that is not held can cause a
@@ -333,7 +339,9 @@ fail if:
 was requested and another thread had already requested a lock upgrade.
 .It Bq Er EBUSY
 .Dv LK_NOWAIT
-was set, and a sleep would have been required.
+was set, and a sleep would have been required, or
+.Dv LK_TRYUPGRADE
+operation was not able to upgrade the lock.
 .It Bq Er ENOLCK
 .Dv LK_SLEEPFAIL
 was set and